FosterStack vs Silo
FosterStack
fosterstack.comSilo
github.comSide by side
| Figure | FosterStack | Silo |
|---|---|---|
| Price from | $41.58/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| macOS | Yes | — |
| Linux | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 4 | 1 |
| Spec score · Build Cache Software | 7.9 (#10) | 7.3 (#21) |
| Authentication | It supports HTTP Basic Auth over TLS, with constant-time credential comparison and no credential logging. | Silo supports HTTP Basic and OIDC/Bearer authentication with read-only and read-write role mapping. |
| Cache management | The server provides size-capped LRU eviction to make room for new entries. | It supports LRU eviction, TTL, byte and entry caps, and reserved free-space thresholds. |
| Deployment | The product is self-hosted and can be run from a Docker image or as a static binary. | Silo is distributed as a fat JAR and a multi-architecture Docker image for linux/amd64 and linux/arm64. |
| Security | The core is MIT-licensed, releases include signed artifacts and SLSA provenance, and security patches are included in the free tier. | The project says it has no phone-home telemetry or accounts and supports atomic writes with crash recovery. |
Plans
In their own words
FosterStack
FosterStack is a self-hosted remote build cache server intended as a replacement for Develocity Build Cache Node. It supports Gradle and the Apache Maven Build Cache Extension remote HTTP mode, although Maven acceptance coverage is in progress. Size-capped LRU eviction frees space for new entries. HTTP Basic Auth over TLS uses constant-time credential comparison, and credentials are not logged. Prometheus metrics and a read-only status page report hit rates and cache size against its cap. Deployment options are a Docker image or static binary; release binaries are available for Linux and macOS on amd64 and arm64. Windows is not built or planned. The MIT-licensed core has signed releases with SLSA provenance, and security patches are included in the free tier. The maker says the free core makes no outbound connections and collects no telemetry or usage data. FosterStack identifies the product as v0.1 and says nobody outside its own work is yet running it in a production build pipeline. The full self-hosted server is free. Team, Business, and Compliance plans are described but not yet available, with listed prices of $49.00 per month, $199.00 per month, and $499.00 per year, respectively.